Hydraulic jack



Jan. 28, 1930. F, c, TORRANCE 1,745,067

HYDRAULIC JACK Filed Oct. 30. 1928 2 Sheets-Sheet l ATTOR N EY Jan. 28, 1930. F. c. ToRRANcE HYDRAULIC JACK Filed oct. so, 1928 2 Sheets-Sheet da; (ySydeEfrd/VCINVENTOR ATTORNEY WITNESS%%fw/M Patented Jan. 28, 1930 UNITED STATES 4PATENT OFFICE FRANCIS CLAUDE ITORRANCE, OF ERIE, PENNSYLVANIA,.ASSIGNOB TO ERIE HYDRAU- LIC MANUFACTURING COMBANY, A CORI?ORATIONl OF PENNSYLVANIA HYDRAULIC TACK Application led October 30, 1928. Serial No. 316,012.

This invention relates to lifting jacks of the hydraulic type. n

An object of the invention comprehends a double wall cylinder. j

Another object of the invention contemplates a base for the cylinder having ports in communication with the compartments in the cylinder.

An additional object of the invention resides in the provision of a valve structure in communication with the ports.

A further object of the invention consists of a handle member and joint therefor adapted to control the valve members.

More specifically stated the lifting plunger in the cylinder is yieldingly retained in lowered position whereby the plunger may be shifted sufficiently below its work when it is desired to retract the j ack-therefrom.

With the above and other objects in view, the invention further consists of the following novel features and details of construction,

to be hereinafter more fully described illus-A trated in the accompanying drawings and pointed out in the appended claims.

In the drawings Figure 1 is a side elevation of my invention partly broken away to illustrate' the construction thereof'.

tion.

Figure 3 is a horizontal sectional view taken on line 3-3 of Figure 1.

Figure 4 is a horizontal sectional view taken on line 44 of Figure 1 through the base and ports.

Figure 5 is a longitudinal sectional view taken on line 5-5 of Figure 1 through the joint and valve construction.

Figure 6 is a vertical sectional view taken on the line 6-6 of Figure 5 through the valve construction.

Figure 7 is a perspective view of the valve member per se.

Figure 8 isv a longitudinal sectional view taken on line 8-8 of Figure 1 through a portion of the handle member. j

. Referring to the drawings in detail wherein like characters of reference denote corresponding parts, the reference character 10 v 1 position. Figure 2 is a top plan view of the inven-- indicates generally a cylinder having inner and outer spaced walls 11 and 12 which define compartments 13 and 14; the purpose `of which will be presently apparent.

A plunger memberl, having a head 16 upon its lowcrmost end and receivable within the compartment 13 'in the cylinder, is pro.- vided with the customary form of plunger washer 17 upon its under side and engageable with the inner side Walls of the inner wall 11 substantially asillustrated in Fi ure 1 of the drawings. Both walls 11 an 12 are threaded upon the ends thereof for engagement with appropriate portions of a base member 18. The particular connection is well illustrated in Figure 1 as in the instance of the application of the top 19 having a packing gland 20 through which the plunger shaft 15 reciprocates. A jack screw 21 is threaded within the bore of the plunger shaft 15.

A collar, such as indicated at 22, is carried upon the upper end and periphery of the i plunger shaft 15 and which is provided with laterally projecting ears 23 having connection with the upper ends of retractile springs 24 joined at their opposite ends with screw eyes 25 carried by the base 18 to normally retain the plunger shaft to occupy the Figure A flange 26 of semi-circular configuration carried by and upstanding from the base 18 is provided with an inwardly projected and curved wall 27. Spaced partitions 28 and 29 within the cup-shaped housing defined by the flange 26 and wall therefor are adapted to provide compartments 30 and 31 respectively. A sleeve 32, having central connection with the partitions 28 and 29, is projected outwardly and axially thereof and which terminates to provide a valve seat 33 within its outermost end adapted to seat a ball check valve 34 thereagainst induced by the action of a compression spring 35 which is regulated as to tension by an adjusting screw 36 threadedwithin the flange 26. The bore of the sleeve 32 is in constant communication with the compartment 31 as illustrated in Fi re 5 of the drawings. The enlarged end o .a tubular member 37 threadedly engaged with the outer side walls of the projecting portion of the sleeve 32 and abutting the adjacent sur# faces of the artition 28 defines an annular shoulder portion 38 a ainst which a coupling 89, nockingly mounte u on the reduped por i tion of the tubular mem r, abuts. l

A jam nut 40, threaded 'upon the outer side walls of and adjacent the closed end of the tubular member 37, is adapted to engage the opposite end of the coupling 39 to retain same 1n position for use. Displacement of the jamy nut 40 is prevented by a pin member or set screw, suc as indicated at 41. The closed or solid end 42 of the tubular member 87 is projected through a central opening in the closedend of the cup-shaped housing member 43. The periphery of the cupshaped housing member 43 is provided with a shoulder portion 44 adapted to abut the adjacent peripheral edges of the flange 26 and wall 27 therefor whereas a rim 45 extended from the shoulder 44 is receivable within an annular recess 46 Iwhereby a movable joint is provided between the flange and cup-shaped ousi'ng member. A nut 47, carried upon the outermost end of the closed end 42 of the .tubhular member 37, is adapted to engage the outer surface ofthe closed end of the housing member 43 to retain the rim 45 therefor within the recess 46. e

A valve member 48 of sleeve like formaf vtion having a cut-outortion 49 in the side wall thereof is provi ed with a U-shaped member 50 extended from one end. A tastud 51, carried by and outwardly profrom the U-shaped member 50 and axially' aligned with the bore of the sleeve 'like valve member 48 is adapted for disposition adjacent the ba check valve 34 as best illustrated in Figure 5 of the drawings. I compression spring 52 is inter osed between the U-shape member 50 an the seat 33 for the ball check valve 34. Obviously the valve member 48 is slidably mounted within the tubular member 37 and limited as to action therein by a pin 53 carried by the latter and disposed within an elongated slot 54 Vin the valve. A ball valve 55, carried within the valve member 48 and adjacent one end in oppositely disposed relation to that of the tapered stud 51 is retained therein between fingers 56 and a compression spring 57. A va ve seat 58 within a ri ht angularl disosed bore 59 in the closes bular member 37 is adapted to normally engge the ball check valve` in the manner. s own in Figure 5 of the drawings. A nut 60, carried u on the outer surface of the closed end 42 o the tubular member 37 within the cup-shaped housing 43, is provided with a port 61 adapted for communication with the right angu said port being 1n communication with the interior of the cup-shaped housing mem- .ber 43.l p 65 A barrel or lever structure 62, carried by 'and 64 joined in end to end relation in conjunction with the barrel or leverl structure end 42 of t e tu-l arly disposed bore 59 therein,4

and outwardly projected from the cupshaped housing member 43, is adapted for communication with the interior thereof through passageways 63. Pipe sections 63 62 are ada ted to provide a housing for a lunger ro 65 slidin within a sleeve mem- Eer 66 having threade connection at its lowermost end with the coupling 39, The lowermost extremity Vof the plunger rod 65 is pointed, as at 67', whereby the latter may be guided within the cut-out portion or portion removed 49 in the side wall of the sleeve like valve member 48.

The plunger rod.65 is also slid Within a packing gland 68 beyond the sleeve member 66 for connection with a coupling 69 within the pipe section 64. An operating rod 70, having connection with the opposite end of the coupling 69, is projected through the outermnst end of the pipe section 64 and connected with a cross bar handle 71 exteriorly thereof.

In Figure 4 of the drawings, the view illustrates the relative arrangement of ports or passageways 72 and 73 which are adapted to establish constant communication between the compartments 14 and 31 and the compartments 13 and 30 respectively.

From the horizontal sectional view in Figure 3 of the drawings it is manifest'that the top 19 for the cylinder is apertured, as at 74, to establish means of communication between the upper ends of the compartments 13 and 14, the purpose of such communication will be presently apparent.

In actual use, the plunger shaft 15 is normally induced to occupy the Figure l position by the action of the retractile springs 24.

When the shaft 65 is successively reciprocated Within the sleeve 66, quantities of oil which fill the compartments 13 and 14, the entire valve structure and the barrel or lever structure 62 will be drawn through the port 73 from the bottom ofy the compartment 14 and directed to the compartment 30. The oil will'then travel through the cup-shaped hous; ing member 43 through the registering ports 59 and 61, past'the ball check valve 55, which is caused to open, through the valve member 48 and cut-out-portion 49 therein. y

Suitable displacement of the oil will also be taken care of within the barrel or lever structure 62 inasmuch as the latter is adapted for communication with the cup-shaped housing member 43 through the annular passage 63. From the illustration of the handle construction in Figure 8 of the drawings, it is obviously apparent that oil may travel therethrough for appreciable distances within the end of the barrel or lever structure 62, according to the height to which the jack screw 21 is raised. Downward movement of the shaft 65 will cause the ball check valve 130 67 of the shaft 65 Will be guided within the',

34 to open whereby the oil under compression within the valve compartment Iwill pass through the compartment 31, the port or passage ,72 and upwardly within the bottom of the compartment 13 beneath the plunger 16.

l-Vhen it is desired to lower the jack screw 21, thc shaft 65 is shoved downwardly as far as the same will go. The pointed extremity cut-out portion 49 in the sleeve like valve member 48 to shift the latter toward the ball check valve to effect contacting engagement of the tapered stud l therewith to unseat the valves 34 and 55. As long as the ball check valve 34 is held unseated, the oil beneath the plunger will be forced through the port 72, the compartment 31, the sleeve 3:2, past the ball check valve 34, through the sleeve like valve lnember 48 and the ball check valve therein, through the angularly disposed port 59, the port G1, through the compartment defined within the cup-shaped housing member 43, through the compartment 30, the port 73 and upwardly within `the compartment 14 through the passages 74 into the top of the compartment 13 above the plunger 16. The retractile springs 24 Will also materially aid in the lowering action of the jack screw.

The particular assembly and connection of the valve structure in conjunction with the handle member provides a turning joint by means of which ease in the application and recovery of the jack may be facilitated in the instance of employing same as a motor ve; hicle jack. The cut-out portion 49 is made large enough to compensate With the positions occupied by the handle member Without rcnderingthe valve structure inoperative commensurate with the particular disposition of the handle.

The invention is susceptible of various changes in its form, proportions and minor details of construction, and the right is herein reserved to make such changes as properly fall within the scope of the appended claims.

Having thus described the invention, What is claimed is 1. A hydraulic jack comprisinor a base including a multiple'ivallcd cylinder defining inner and outer compartments therein having communication at their upper ends, a plungyer shaft mounted for reciprocating action within the innermost of the compartments, a flange carried by the base including compartments adapted for communication With'the lowermost ends of each of the compartments within the cylinder through passageways in the base, a cup-shaped housing member mounted for rocking movement upon the flange, ball check valves carried within the flange and housing to normally close the passageways and compartments, a slide valve mounted within the housing member, a U-shaped member carried upon one end of the slide valve, a tapered stud outwardly projecting from the U-shaped member and adapted for contacting engagement With one of the check valves to unseat the latter, said valve having a portion removed, and a plunger shaft operable within the valve member adapted for insertion within the space left by the portion removed in the valve to shift the tapered stud thereof for contacting engagement with the aforementioned valve.

2. Ahydraulic j ack construction comprising a base having a multiple Walled cylinder defining inner and outer compartments therein, a plunger shaft mounted for reciprocating action Within the' innermost of the compartments, a flange carried by the base having compartments in communication with the cylinder compartments through passageways in the base, a cu -shaped housing member mounted for roc zingV movement upon the flange, a sleeve carried upon the flange and extended through the housing member, valve members included Within the flange and housing to check the flow of fluid from the compartments to the valve construction and from one of the cylinder compartments to the other, a sleeve valve `having a portion removed and slidably mounted Within the sleeve member in the housing, a U-shaped member carried by and extended from one end of the sleeve valve, a tapered stud projected from the yoke portion of the U-shaped member in advance of the sleeve valve for selective con! tacting engagement with the adjacent valve member, a lever structure carried by the housing, and a plunger shaft mounted Wit-hin the lever structure being provided with a tapered extremity adapted to be guided Within space left by the portion removed in the sleeve valve to shift samefto cause" contacting engagement of the tapered stud thereof with the adjacent valvel-member.

3.` A hydraulic jack construction comprising a base having a multiple Walled cylinder defining inner and outer compartments therein, a plunger shaft mounted for reciprocating action Within the innermost of the compartments, a flange carried by the base having compartments in communication with the cylinder compartments through passageways in the base, a cup-shaped housing member mounted for rocking movement upon the flange, a sleeve carried upon the flange and extended through the housing member, valve members included within the flange and housing to check the flow of fluid from the compartments to the valve construction and from one of the cylinder compartments to the other, a` sleeve valve havin a portion removed and slidably mounted lwithin the sleeve member in the housin a U-shaped member carried by and exten ed from one end of theysleeve valve, a tapered stud projected fromthe yoke portion of the U-sha ed member in advance of the sleeve valve or selective contacting `engagement with the adjacent valve member, a

ever structure carried b the housing, a plun r shaft mounted within the lever structure ing rovided with a tapered extremity adapted to guided within space left by the portion removed in the sleeve valve to shift same to cause contactin engagement of the tapered stud thereof wit theladjacent valve f member, and means establishing connection p a sleeve va so between the plunger shaft and base to yield- 'ingly inducethe shaft to occupy a lowered 4. A hydraulic jack construction comprisinlJ1 base having a multiple walled cylinder de 'ng inner and outer com artments therein, a plunger shaft mounted or reciprocating action within theinnermost of the compartments, a flange carried bythe base having 'compartments in communication with the cylinder compartments through passageways in the base, a cu 4-shaped housing member mounted for roc ing movement upon the flange; a sleeve carried upon the flange and extended through the housing member, valve members included within the flange and h'ousing to check the iow of fluid from the compartments to the valve construction and from one of the cylinder compartments to the other, ve having a portion removed and slidabl mounted within the sleeve member in the ousing and carrying one of the valve members, a U-shaped member carried by and extended from one end of the sleeve valve, a.

' tapered stud projected from the yoke portion of the U-sha member in advance of the sleeve valve or selective contacting en agement with the adjacent valve member, a ever structure carried by the housing, a plun er shaft mounted within the lever structure eing provided with a tapered extremity adapted to be guided within the space left by the i yportion removed in the sleeve valve to shift same to cause contacting engagement of the tapered stud thereof with the adjacent valve member, `and means establishing connection between the plunger shaft and base to yieldingly induce thel shaft to occupy a lowered position.

In testimony whereof I aix my si ature.

FRANCIS CLAUDE TORRA CE. 

